[Amps] 3-400Z vs. 4-400A

[Richard]

>Some time ago a guy told me he was substituting the
>4-400A tube in his Swan Mark 1 amplifier instead of
>using the 3-400Z tube.  He had a large supply of the
>4-400A tubes on hand and said they were working very
>well in the Swan Mark 1 even though it was designed
>around the 3-400Z tube.  Is this an ok thing to do in
>the long term?
>73,
In g-g, at 0v bias, the 4-400A needs c. 3400V to idle at the requisite 
75mA. 

-  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, 
www.vcnet.com/measures.  
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